These release notes are for the Cisco MGX-RPM-1FE-CP for Cisco IOS Release 12.2(8)MC1.These release notes are updated as needed to describe new features, memory requirements, hardware support, software platform deferrals, and changes to the microcode and related documents.

The MGX-RPM-1FE-CP back card is designed to be used with an MGX 8850 that is equipped with one or more RPM-PRs and that terminates some number of T1 lines. Each MGX-RPM-1FE-CP back card has a termination capacity of up to eight T1s (four per MLP bundle). The MGX-RPM-1FE-CP is only supported with the MLP encapsulation.

The MGX-RPM-1FE-CP back card contains one Fast Ethernet (100Base-Tx) interface. The interface has an RJ45 connector that is used to connect the card to a Category 5 un-shielded twisted pair (UTP) cable. Both half- and full-duplex operation are supported.

MGX-RPM-1FE-CP Back Card in an IP-RAN of a Mobile Wireless Network

The MGX-RPM-1FE-CP back card off loads the compression/decompression of RTP/UDP headers and the multiplexing/demultiplexing of PPP frames.

The supported use of the MGX-RPM-1FE-CP back card is within an IP-RAN of a mobile wireless network. In mobile wireless networks, radio coverage over a geographical space is provided by a network of radios and supporting electronics (Base Transceiver Station or BTS) distributed over a wide area. Each radio and supporting electronics represents a "cell." In traditional networks, the radio signals or radio data frames collected in each cell are forwarded over a T1 (or similar low-speed, leased) line to a centralized Base Station Controller (BSC) where they are processed.

The implementation of the MGX-RPM-1FE-CP backcard in the IP-RAN solution requires the following components:

•Cisco MGX 8850

•RPM-PR

•MGX-RPM-1FE-CP back card

•FRSM card

•BTS router (Cisco MWR 1900 Mobile Wireless Edge Router)

The solution uses OSPF as the routing protocol and requires MLP for transmission of the packets between the aggregation node (MGX8850) and the BTS. It requires you to configure the following:

•PPP Multiplexing—Method, as defined in RFC 3153, of sending multiple PPP encapsulated packets in a single PPP frame.

Limitations, Restrictions, and Important Notes

When working with a MGX-RPM-1FE-CP back card, please take note of the following limitations, restrictions, and important notes:

•FE and multilink interfaces should be shut down before online insertion and removal (OIR) of the MGX-RPM-1FE-CP.

•The MGX-RPM-1FE-CP is only supported on the Cisco MGX 8850 RPM-PR.

•For PPP Multiplexing, MLP must be configured on the MGX-RPM-1FE-CP back card.

•For error messages to be stored, console logging must be configured.

•The IP MTU should be set to 512 bytes or less on multilink interfaces.

•The MGX-RPM-1FE-CP back card supports up to 8 multilink interfaces.

•MLP with LFI is not supported by the Cisco MWR 1900 router. Therefore, MLP with LFI must be disabled on peer devices connecting to the Cisco MWR 1900 router T1 MLP connections.

•To fully disable PPP Multiplexing, issue the no ppp mux command on the T1 interfaces of the routers at both ends of the T1 link. If PPP Multiplexing remains configured on one side of the link, that side will offer to receive PPP multiplexed packets.

Caveats in Cisco IOS Release 12.2(8)MC1

The following sections list and describe the open and closed caveats for the Cisco MGX-RPM-1FE-CP with Cisco IOS Release 12.2(8)MC1.

Open Caveats

The caveats listed in this section are open in Release 12.2(8)MC1.

•CSCdw40302

If two MGX-RPM-1FE-CP back cards are installed at boot up or a second MGX-RPM-1FE-CP back card is installed in a running system, cryptic error messages might display and the system might become unstable. If the system be comes unstable, the instability could lead to a system crash.

Workaround: Only one MGX-RPM-1FE-CP back card is supported per RPM-PR. Do not install a second MGX-RPM-1FE-CP back card before removing the first back card. If two back cards are installed at any one time, we recommend that you reload the RPM-PR with only one MGX-RPM-1FE-CP back card installed.

Resolved Caveats

The caveats listed in this section are resolved in Release 12.2(8)MC1.

•CSCdx18889

Attempts to ping a Cisco MWR 1900 router through the MGX RPM-PR to a destination off the FE port fails and no ARP entries are added to the RPM-PR.

•CSCdx61465

An incorrect hit ratio is displayed when issuing the show ip rtp header-compression command.

Troubleshooting

To collect data for reporting back card and router issues, issue the following command:

•show tech-support—Displays general information about the router when it reports a problem.

•show logging—Displays information in the syslog history table.

Documentation Updates

This section contains information that was not included or was documented incorrectly in the MGX-RPM-1FE-CP Back Card Installation and Configuration Note. The heading in this section corresponds with the applicable section title in the documentation.

show ppp mux

The efficiency improvement factor calculation documented in the show ppp mux command section is incorrect. The correct improvement factor calculation uses bytes, not packets, and is as follows:

Related Documentation

The following sections describe the documentation available related to the Cisco MGX-RPM-1FE-CP back card.These documents consist of hardware and software installation guides, Cisco IOS configuration guides and command references, system error messages, and other documents.

Documentation is available as printed manuals or electronic documents.

Platform-Specific Documents

These documents are available for the Cisco MWR 1900 Mobile Wireless Edge Router on Cisco.com and the Documentation CD-ROM:

•MGX-RPM-1FE-CP Back Card Installation and Configuration Note

•RPM-PR Installation and Configuration

•Cisco MWR 1900 Mobile Wireless Edge Router

–Cisco MWR 1900 Hardware Installation Guide

–Cisco MWR 1900 Software Configuration Guide

–Cisco MWR 1900 Rack Mounting Instructions

–Cisco MWR 1900 Regulatory Compliance and Safety Information

•VWIC-2MFT-T1-DIR, VWIC-2MFT-E1-DIR Installation Instructions

Feature Modules

Feature modules describe new features supported by Cisco IOS Release 12.2 MC and are updates to the Cisco IOS documentation set. A feature module consists of an overview of the feature, configuration tasks, and a command reference.

On Cisco.com at:

Technical Documents: Cisco IOS Software: Cisco IOS Release 12.2: New Feature Documentation: New Features in 12.2-Based Limited Lifetime Releases: New Features in Release 12.2 MC: New Features in Release 12.2 MC1

On the Documentation CD-ROM at:

Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.2: New Feature Documentation: New Features in 12.2-Based Limited Lifetime Releases: New Features in Release 12.2 MC: New Features in Release 12.2 MC1

Obtaining Documentation

These sections explain how to obtain documentation from Cisco Systems.

World Wide Web

You can access the most current Cisco documentation on the World Wide Web at this URL:

Documentation CD-ROM

Cisco documentation and additional literature are available in a Cisco Documentation CD-ROM package, which is shipped with your product. The Documentation CD-ROM is updated monthly and may be more current than printed documentation. The CD-ROM package is available as a single unitor through an annual subscription.

Obtaining Technical Assistance

Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain online documentation, troubleshooting tips, and sample configurations from online tools by usingthe Cisco Technical Assistance Center (TAC) Web Site. Cisco.com registered users have complete access to the technical support resources on the Cisco TAC Web Site.

Cisco.com

Cisco.com is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information,networking solutions, services, programs, and resources at any time, from anywhere in the world.

Cisco.com is a highly integrated Internet application and a powerful, easy-to-use tool that provides a broad range of features and services to help you with these tasks:

Technical Assistance Center

The Cisco Technical Assistance Center (TAC) is available to all customers who need technical assistance with a Cisco product, technology, or solution. Two levels of support are available: the Cisco TAC Web Site and the Cisco TAC Escalation Center.

Cisco TAC inquiries are categorized according to the urgency of the issue:

•Priority level 2 (P2)—Your production network is severely degraded, affecting significant aspects of business operations. No workaround is available.

•Priority level 1 (P1)—Your production network is down, and a critical impact to business operations will occur if service is not restored quickly. No workaround is available.

The Cisco TAC resource that you choose is based on the priority of the problem and the conditions of service contracts, when applicable.

Cisco TAC Web Site

You can use the Cisco TAC Web Site to resolve P3 and P4 issues yourself, saving both cost and time. The site provides around-the-clock access to online tools, knowledge bases, and software. To access the Cisco TAC Web Site, go to this URL:

All customers, partners, and resellers who have a valid Cisco service contract have complete access to the technical support resources on the Cisco TAC Web Site. The Cisco TAC Web Site requires a Cisco.com login ID and password. If you have a valid service contract but do not have a login ID or password, go to this URL to register:

Before calling, please check with your network operationscenter to determine the level of Cisco support services to which your company is entitled: for example, SMARTnet, SMARTnet Onsite, or Network Supported Accounts (NSA). When you call the center, please have available your service agreement number and your product serial number.